French hospitals are increasingly vulnerable to the impacts of climate change, with projected costs reaching €174 billion by 2050. These expenses stem from the need to adapt infrastructure and operations to extreme weather events, including heatwaves, floods, and storms. The financial burden will cover necessary renovations, increased cooling demands, and emergency preparedness measures. Without significant investment in adaptation, the healthcare system risks being overwhelmed and its ability to provide care compromised. The analysis highlights the urgent need for proactive planning and resource allocation to mitigate these risks. This situation places hospitals on the front lines of climate change response, demanding immediate attention and strategic investment. The escalating costs underscore the economic consequences of inaction on climate change within the healthcare sector.